Migrate a list of existing svn repositories to git using svn2git

bulk_svn_to_git.sh

#!/bin/bash
set -v        # verbose output

#
# Migrate a list of existing subversion repositories to git using svn2git. Assumes
# the following repository layouts:
#   svn://example.com/<repository>/
#     assets/
#     branches/
#     trunk/
#     tags/
#
#   [email protected]:<repository>.git
#
# Creates two new repositories from the above structure: <repository> and <repository>-assets.
#
#
# Requirements:
#   git
#   grep
#   ruby (for svn2git)
#   rubygems (for svn2git)
#   svn
#   svn2git - http://github.com/nirvdrum/svn2git

REPOSITORY_NAMES="first_repo_name second_repo_name"

GIT_USER='git'
GIT_HOST='git.example.com'
BASE_SVN_URL='svn://svn.example.com'
BASE_WORKING_DIR='/home/myuser/workspace/'

##############################
# usage
##############################
function usage() {
  echo ""
  echo "Usage: ./$0"
  echo ""
}

##############################
# check args
##############################
# function check_args() {
#     if [ -z $SOME_ARG ]; then
#       usage
#       exit 1
#     fi
# }

# ======================================================================
#
# Function: confirm
# Asks the user to confirm an action, If the user does not answer yes,
# then the script will immediately exit.
#
# Parameters:
# $@ - The confirmation message
#
# Examples:
# >  # Example 1
# >  # The preferred way to use confirm
# >  confirm Delete file1? && echo rm file1
# >
# >  # Example 2
# >  # Use the $? variable to examine confirm's return value
# >  confirm Delete file2?
# >  if [ $? -eq 0 ]
# >  then
# >      echo Another file deleted
# >  fi
# >
# >  # Example 3
# >  # Tell bash to exit right away if any command returns a non-zero code
# >  set -o errexit
# >  confirm Do you want to run the rest of the script?
# >  echo Here is the rest of the script
#
# ======================================================================
#################
# confirm - taken from http://wuhrr.wordpress.com/2010/01/13/adding-confirmation-to-bash/
#################
function confirm() {
  echo -n "$@ "
  read -e answer
  for response in y Y yes YES Yes Sure sure SURE OK ok Ok yup YUP Yup
  do
    if [ "_$answer" == "_$response" ]
    then
        return 0
    fi
  done

  # Any answer other than the list above is considered a "no" answer
  return 1
}

function install_svn2git() {
  config Would you like to install the latest svn2git? [y/N]
  if [ $? -eq 0 ]; then
    `gem install svn2git`
  fi
}

function mkdir_if_not() {
  if [ ! -d $1 ]; then
    echo "Making dir: $1"
    mkdir "$1"
  fi
}

function repo_dir() {
  echo "${BASE_WORKING_DIR}/$1"
}

function mkrepodir() {
  local repo_name=$1
  local repository_path
  repository_path=$(repo_dir ${repo_name})
  mkdir_if_not $repository_path
  echo "$repository_path"
}

function migrate_primary() {
  local repo_name=$1
  local repository_path=$(repo_dir ${repo_name})
  mkdir_if_not ${repository_path}
  cd ${repository_path}
  svn2git ${BASE_SVN_URL}/${repo_name}
  add_dotgitignore ${repository_path} true
  add_remote_origin ${repo_name}
  push_origin_to_master ${repository_path}
  cd ..
}

function create_assets_repo() {
  local repo_name=$1
  local repository_path=$(repo_dir "${repo_name}/shared")

  local r=`svn ls ${BASE_SVN_URL}/${repo_name}|grep assets`
  if [ "" == "${r}" ]; then
    echo "WARNING: No assets repository configured for: ${repo_name}"
  else
    mkdir_if_not ${repository_path}
    cd ${repository_path}
    svn2git ${BASE_SVN_URL}/${repo_name}/assets --rootistrunk --no-minimize-url
    add_dotgitignore ${repository_path}
    add_remote_origin ${repo_name}-assets
    push_origin_to_master ${repository_path}
    cd ..
  fi
}

# Function: add_dotgitignore
#
# Adds/appends to a .gitignore
#
# Parameters:
#   repository_path - the local directory path to the repository
#   append_rails_app_options - boolean - Optional; default: no action app options appended
# Examples:
# >  add_dotgitignore /path/to/my/git/repo
# >  add_dotgitignore /path/to/my/git/repo true
function add_dotgitignore() {
  local ignore_path="$1/.gitignore"

  touch ${ignore_path}
  cat <<EOFEOF >> ${ignore_path}
.DS_Store
.bundle
EOFEOF
  if [ "$2" == true ]; then
    cat <<EOFEOF >> ${ignore_path}
log/*.log
tmp/**/*
config/database.yml
db/*.sqlite3
*.swp
index/*
public/assets
shared
vendor/gems
EOFEOF
  fi
  git add ${ignore_path} && git ci -m'Add/update .gitignore'
}

function add_remote_origin() {
  local repo_name=$1
  git remote add origin ${GIT_USER}@${GIT_HOST}:${repo_name}.git
}

function push_origin_to_master() {
  local repository_path=$1
  cd ${repository_path}
  git push origin master
  cd ..
}

function init() {
  local r=`gem list svn2git|grep svn2git`
  if [ "" == "${r}" ]; then
    install_svn2git
  fi

  mkdir_if_not $BASE_WORKING_DIR
  for repo_name in $REPOSITORY_NAMES; do
    migrate_primary $repo_name
    create_assets_repo $repo_name
  done
}

init
exit 0